Your opinions are not evidence no matter how much you dress them up in notation. I asked for evidence as I could use it.
Self-discipline is a better indicator for income and education than IQ.[0] So I know for a fact that your a priori fact is not valid. It's all good to share opinions, but please do not present them as reality when they are not.
And I didn't bother to point out particular studies validating my claims because much of this has been known to humans for close to a 100 years. In the same vein as linking to a proof of the undecidability of the halting problem would be excess references given the nature of HN community.
If you want an example study look at the "Health and longevity" section on the above linked Wikipedia page.
Or to directly support my thesis about X1 and X2 separation, first look at Wikipedia IQ page and the "Social correlations" section, it's generally around 0.5:
https://en.m.wikipedia.org/wiki/Intelligence_quotient
[0] https://journals.sagepub.com/doi/10.1111/j.1467-9280.2005.01...